Slide picker

src/components/SlidePickerBox.cpp

@@ -0,0 +1,234 @@
+//
+// Created by Krad on 2021/11/24.
+//
+
+#include "SlidePickerBox.h"
+#include <QPainter>
+#include <QMouseEvent>
+#include <QLabel>
+#include <QFont>
+#include <qdebug.h>
+const int fontSize = 80;
+SlidePickerBox::SlidePickerBox(QWidget *parent):QWidget(parent) {
+    this->setFixedHeight(360);
+
+    QLabel* label = new QLabel(this);
+    label->setText("1");
+    label->setFixedHeight(110);
+    label->setAlignment(Qt::AlignCenter);
+    label->setObjectName("sliderPickerLabel");
+    label->setFixedHeight(fontSize);
+    label->setFixedWidth(320);
+    QPoint p = this->mapToGlobal({this->contentsMargins().left(),50-fontSize/2});
+    label->move(p);
+    lbls.push_back(label);
+    QLabel* label1 = new QLabel(this);
+    label1->setText("2");
+    label1->setFixedHeight(110);
+    label1->setAlignment(Qt::AlignCenter);
+    label1->setObjectName("sliderPickerLabel");
+    label1->setFixedHeight(fontSize);
+    label1->setFixedWidth(320);
+    QPoint p1 = this->mapToGlobal({this->contentsMargins().left(),150-fontSize/2});
+    label1->move(p1);
+    lbls.push_back(label1);
+    QLabel* label2 = new QLabel(this);
+    label2->setText("3");
+    label2->setFixedHeight(110);
+    label2->setAlignment(Qt::AlignCenter);
+    label2->setObjectName("sliderPickerLabel");
+    label2->setFixedHeight(fontSize);
+    label2->setFixedWidth(320);
+    QPoint p2 = this->mapToGlobal({this->contentsMargins().left(),250-fontSize/2});
+    label2->move(p2);
+    lbls.push_back(label2);
+
+    selectedLbl = label1;
+    label1->setStyleSheet("color:white");
+    label->setStyleSheet("background:transparent");
+    label2->setStyleSheet("background:transparent" );
+    QWidget* line1 = new QWidget(this);
+    line1->setFixedSize(320,100);
+    line1->setObjectName("topBottomLine");
+    line1->raise();
+    QPoint lp = this->mapToGlobal({this->contentsMargins().left(),100});
+    line1->move(lp);
+
+    selectedIndex = 1;
+}
+
+void SlidePickerBox::mousePressEvent(QMouseEvent * ev) {
+    isDragging = true;
+    o_x = ev->pos().x();
+    o_y = ev->pos().y();
+    QWidget::mousePressEvent( ev);
+}
+
+void SlidePickerBox::mouseMoveEvent(QMouseEvent *ev) {
+    if(lbls.count()<2) return;
+    if(isDragging)
+    {
+        int offset = (ev->pos().y()-o_y);
+        //防止速度过快
+        while(abs(offset)>50)
+        {
+            offset=offset/2;
+        }
+        //防止拉过头
+        int selectItemCenter = selectedLbl->geometry().center().y();
+        if (selectedLbl == lbls.last() && selectItemCenter<=150 && offset<0) return;
+        if (selectedLbl == lbls.first() && selectItemCenter>=150 && offset>0) return;
+        int i = 0;
+        for (auto item : lbls)
+        {
+            //不需要横向
+            //int nx = item->geometry().left()+(ev->pos().x()-o_x);
+            int ny = item->geometry().top() + offset;
+
+            item->move(item->geometry().left(),ny);
+            int nc = item->geometry().center().y();
+
+            if (nc<=200 && nc>100)
+            {
+                item->setStyleSheet("color:white");
+                selectedLbl = item;
+                selectedIndex = i;
+            } else{
+                item->setStyleSheet("background:transparent");
+            }
+            i++;
+        }
+        o_x = ev->pos().x();
+        o_y = ev->pos().y();
+        repaint();
+    }
+    QWidget::mouseMoveEvent(ev);
+}
+
+void SlidePickerBox::mouseReleaseEvent(QMouseEvent *ev) {
+    isDragging = false;
+    adjustPositon();
+    QWidget::mouseReleaseEvent(ev);
+}
+
+void SlidePickerBox::adjustPositon() const {
+    if (selectedLbl->geometry().center().y() != 150)
+    {
+        //选择完毕，选中项回归正位
+
+        int offset = 150 - selectedLbl->geometry().center().y();
+        for (auto item : lbls)
+        {
+            int ny = item->geometry().top()+offset;
+            item->move(item->geometry().left(),ny);
+        }
+    }
+}
+
+void SlidePickerBox::paintEvent(QPaintEvent *ev) {
+    QWidget::paintEvent(ev);
+}
+
+void SlidePickerBox::paintText(QString txt, int x, int y, const QColor& color) {
+    QPainter painter(this);
+    painter.setRenderHint(QPainter::TextAntialiasing, true);
+    QFont f;
+    f.setPixelSize(30);
+    painter.setFont(f);
+    painter.setPen(color);
+    painter.drawText(x,y,txt);
+}
+
+void SlidePickerBox::setItems(QStringList itemsList) {
+    this->items = itemsList;
+    hideLabel(selectedLbl);
+    hideLabel(prevLbl);
+    hideLabel(nextLbl);
+    for (auto item : lbls)
+    {
+        delete item;
+    }
+    selectedLbl = nullptr;
+    prevLbl = nullptr;
+    nextLbl = nullptr;
+    lbls.clear();
+
+    for (QString str : this->items)
+    {
+        QLabel* lbl = new QLabel(this);
+        lbl->setText(str);
+        lbl->setFixedHeight(110);
+        lbl->setAlignment(Qt::AlignCenter);
+        lbl->setObjectName("sliderPickerLabel");
+        lbl->setFixedHeight(fontSize);
+        lbl->setFixedWidth(320);
+        lbls.push_back(lbl);
+        QPoint p = this->mapToGlobal({this->contentsMargins().left(),-150});
+        lbl->move(p);
+    }
+    selectedIndex = lbls.count()-1;
+    setSelectedValue(this->items.last());
+}
+
+QString SlidePickerBox::getSelectedValue() {
+    if (!selectedLbl) return "";
+    return selectedLbl->text();
+}
+
+void SlidePickerBox::setCurrentLabel(QLabel *label) {
+    if (selectedLbl)hideLabel(selectedLbl);
+    if (label) {
+        QPoint lp = this->mapToGlobal({this->contentsMargins().left(), 100});
+        label->move(lp);
+        label->show();
+        selectedLbl = label;
+    }
+}
+
+void SlidePickerBox::setNextLabel(QLabel *label) {
+    if (nextLbl)hideLabel(nextLbl);
+    if (label){
+        QPoint lp = this->mapToGlobal({this->contentsMargins().left(),200});
+        label->move(lp);
+        label->show();
+        nextLbl = label;
+    }
+}
+
+void SlidePickerBox::setPrevLabel(QLabel *label) {
+    if (prevLbl)hideLabel(prevLbl);
+    if (label) {
+        QPoint lp = this->mapToGlobal({this->contentsMargins().left(), 0});
+        label->move(lp);
+        label->show();
+        prevLbl = label;
+    }
+}
+
+void SlidePickerBox::hideLabel(QLabel *label) {
+    if (!label) return;
+    QPoint lp = this->mapToGlobal({this->contentsMargins().left(), -150});
+    label->move(lp);
+}
+
+void SlidePickerBox::setSelectedValue(QString& val) {
+    qDebug()<<"set value:"<<val;
+    for (int i = 0; i < lbls.count() ; ++i) {
+        if(lbls[i]->text() == val) {
+            selectedIndex = i;
+            break;
+        }
+    }
+    int first_y = -100 * (selectedIndex-1);
+    for (int i = 0; i < lbls.count() ; ++i) {
+        QPoint lp = {this->contentsMargins().left(), first_y+i*100};
+        lbls[i]->move(lp);
+        lbls[i]->show();
+        lbls[i]->setStyleSheet("background:transparent");
+        lbls[i]->lower();
+    }
+    selectedLbl = lbls[selectedIndex];
+    lbls[selectedIndex]->setStyleSheet("color:white");
+    adjustPositon();
+}
+